<template>
  <div class="tags" v-if="showTags">
    <ul>
      <li class="tags-li" v-for="(item,index) in tagsList" :class="{'active': isActive(item.path)}" :key="index">
        <router-link :to="item.path" class="tags-li-title">
          {{item.title}}
        </router-link>
        <span class="tags-li-icon" @click="closeTags(index)"><i class="el-icon-close"></i></span>
      </li>
    </ul>
    <div class="tags-close-box">
      <el-dropdown @command="handleTags">
        <el-button size="mini" type="primary">
          标签选项<i class="el-icon-arrow-down el-icon--right"></i>
        </el-button>
        <el-dropdown-menu size="small" slot="dropdown">
          <el-dropdown-item command="other">关闭其他</el-dropdown-item>
          <el-dropdown-item command="all">关闭所有</el-dropdown-item>
        </el-dropdown-menu>
      </el-dropdown>
    </div>
  </div>
</template>

<script>
import bus from './bus';
export default {
  data () {
    return {
      tagsList: []
    }
  },
  methods: {
    isActive (path) {
      if (path.includes('/log') && this.$route.fullPath.includes('log')) {
        return true;
      }
      return path === this.$route.fullPath;
    },
    // 关闭单个标签
    closeTags (index) {
      const delItem = this.tagsList.splice(index, 1)[0];
      const item = this.tagsList[index] ? this.tagsList[index] : this.tagsList[index - 1];
      if (item) {
        delItem.path === this.$route.fullPath && this.$router.push(item.path);
      } else {
        this.$router.push('/');
      }
    },
    // 关闭全部标签
    closeAll () {
      this.tagsList = [];
      this.$router.push('/');
    },
    // 关闭其他标签
    closeOther () {
      const curItem = this.tagsList.filter(item => {
        return item.path === this.$route.fullPath;
      })
      this.tagsList = curItem;
    },
    // 设置标签
    setTags (route) {
      console.log(route);
      console.log(this.$route);
      const isExist = this.tagsList.some(item => {
        console.log(item.name, route);
        return item.path === route.fullPath;
      })
      if (!isExist) {
        if (this.tagsList.length >= 8) {
          this.tagsList.shift();
        }
        console.log(route);
        if (route.matched && route.matched.length) {
          if (route.fullPath.includes('log') && this.tagsList.some(item => item.path.includes('log'))) {
            this.tagsList.forEach(item => {
              if (item.path.includes('log')) {
                item.path = route.fullPath
              }
            })
          } else {
            this.tagsList.push({
              title: route.meta.title + (route.query.id || ''),
              path: route.fullPath,
              name: route.matched[1].components.default.name
            })
          }
        } else {
          this.tagsList.push({
            title: route.meta.title,
            path: route.fullPath,
            // name: route.matched[1].components.default.name
          })
        }
      }
      bus.$emit('tags', this.tagsList);
      console.log(this.tagsList);
    },
    handleTags (command) {
      command === 'other' ? this.closeOther() : this.closeAll();
    }
  },
  computed: {
    showTags () {
      return this.tagsList.length > 0;
    }
  },
  watch: {
    $route (newValue, oldValue) {
      this.setTags(newValue);
    }
  },
  created () {
    this.setTags(this.$route);
    bus.$on('openTags', (route) => {
      this.setTags(route);
    })
    bus.$on('closeTag', query => {
      let index = 0;
      this.tagsList.forEach((item, i) => {
        if (item.path === query.fullPath) {
          index = i;
        }
      });
      this.closeTags(index)
    })
    // 监听关闭当前页面的标签页
    bus.$on('close_current_tags', () => {
      for (let i = 0, len = this.tagsList.length; i < len; i++) {
        const item = this.tagsList[i];
        if (item.path === this.$route.fullPath) {
          if (i < len - 1) {
            this.$router.push(this.tagsList[i + 1].path);
          } else if (i > 0) {
            this.$router.push(this.tagsList[i - 1].path);
          } else {
            this.$router.push('/');
          }
          this.tagsList.splice(i, 1);
          break;
        }
      }
    })
  }
}

</script>


<style>
.tags {
    position: relative;
    height: 30px;
    overflow: hidden;
    background: #fff;
    padding-right: 120px;
    box-shadow: 0 5px 10px #ddd;
}

.tags ul {
    box-sizing: border-box;
    width: 100%;
    height: 100%;
}

.tags-li {
    float: left;
    margin: 3px 5px 2px 3px;
    border-radius: 3px;
    font-size: 12px;
    overflow: hidden;
    cursor: pointer;
    height: 23px;
    line-height: 23px;
    border: 1px solid #e9eaec;
    background: #fff;
    padding: 0 5px 0 12px;
    vertical-align: middle;
    color: #666;
    -webkit-transition: all 0.3s ease-in;
    -moz-transition: all 0.3s ease-in;
    transition: all 0.3s ease-in;
}

.tags-li:not(.active):hover {
    background: #f8f8f8;
}

.tags-li.active {
    color: #fff;
}

.tags-li-title {
    float: left;
    max-width: 80px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin-right: 5px;
    color: #666;
}

.tags-li.active .tags-li-title {
    color: #fff;
}

.tags-close-box {
    position: absolute;
    right: 0;
    top: 0;
    box-sizing: border-box;
    padding-top: 1px;
    text-align: center;
    width: 110px;
    height: 30px;
    background: #fff;
    box-shadow: -3px 0 15px 3px rgba(0, 0, 0, 0.1);
    z-index: 10;
}
</style>
